What browser are you using? Deleting the cookies will not do anything. It couldn't hurt, but I highly doubt it has anything to do with your problem. You may need to update your browser or Adobe Flash Player Plugin. If that doesn't do the trick, I would just get a different browser. Chrome, Firefox, and Safari are among the best ones that have very few problems and fast browsing.
--To clear the cookies you will want to open the browser, click Tools -- Internet Options. Personally, I if I were you, I would just download cCleaner. It will clean EVERYTHING off your computer and it's very simple to use.